High quality fabric, loved by my teenagers, and the great dane.  If you have a small space, consider carefully, because this will eat it!  It expands to fill space, like the great dane in a bed...  

Pros: Big, quality fabric cover. Soft, can accommodate 2 adults easily, 3 without much effort.  Teenagers use it as a spare bed.  Seriously.
Cons: No liner.  Washing the cover will be a huge undertaking.  A liner would eliminate the hassle.